<template>
  <div class="app-container">
    <el-form :model="queryParams" ref="queryForm" size="small" :inline="true" v-show="showSearch" label-width="68px">
      <el-form-item label="轮播序号" prop="serialNo">
        <el-input
          v-model="queryParams.serialNo"
          placeholder="请输入轮播序号"
          clearable
          @keyup.enter.native="handleQuery"
        />
      </el-form-item>
      <el-form-item label="状态" prop="state">
        <el-select
          v-model="queryParams.state"
          placeholder="请选择状态"
          clearable
          @keyup.enter.native="handleQuery"
        >
          <el-option
            v-for="item in stateOptions"
            :key="item.value"
            :label="item.label"
            :value="item.value"
          />
        </el-select>

      </el-form-item>
      <el-form-item>
        <el-button type="primary" icon="el-icon-search" size="mini" @click="handleQuery">搜索</el-button>
        <el-button icon="el-icon-refresh" size="mini" @click="resetQuery">重置</el-button>
      </el-form-item>
    </el-form>

    <el-row :gutter="10" class="mb8">
      <el-col :span="1.5">
        <el-button
          type="primary"
          plain
          icon="el-icon-plus"
          size="mini"
          @click="handleAdd"
          v-hasPermi="['business:banner:add']"
        >新增
        </el-button>
      </el-col>
      <el-col :span="1.5">
        <el-button
          type="success"
          plain
          icon="el-icon-edit"
          size="mini"
          :disabled="single"
          @click="handleUpdate"
          v-hasPermi="['business:banner:edit']"
        >修改
        </el-button>
      </el-col>
      <el-col :span="1.5">
        <el-button
          type="danger"
          plain
          icon="el-icon-delete"
          size="mini"
          :disabled="multiple"
          @click="handleDelete"
          v-hasPermi="['business:banner:remove']"
        >删除
        </el-button>
      </el-col>
      <!-- <el-col :span="1.5">
        <el-button
          type="warning"
          plain
          icon="el-icon-download"
          size="mini"
          @click="handleExport"
          v-hasPermi="['business:banner:export']"
        >导出
        </el-button>
      </el-col> -->
      <right-toolbar :showSearch.sync="showSearch" @queryTable="getList"></right-toolbar>
    </el-row>
    <el-table v-loading="loading" :data="bannerList" @selection-change="handleSelectionChange">
      <el-table-column type="selection" width="55" align="center"/>
      <el-table-column label="轮播序号" align="center" prop="serialNo"/>
      <el-table-column label="轮播图" align="center" prop="imageUrl" style="width: 400px; height: 200px">
        <template v-slot:default="scope">
          <el-image :src="scope.row.imageUrl" :zoom-rate="2.4" :max-scale="8" :min-scale="0.9"
                    :preview-src-list="[scope.row.imageUrl]" fit="cover"
          />
        </template>
      </el-table-column>
      <el-table-column label="状态" align="center" prop="state">
        <template v-slot:default="scope">
          <span v-if="scope.row.state === 1">
            <el-tag type="success">启用</el-tag>
          </span>
          <span v-if="scope.row.state === 0">
            <el-tag type="info">禁用</el-tag>
          </span>
        </template>
      </el-table-column>
      <el-table-column label="操作" align="center" class-name="small-padding fixed-width">
        <template slot-scope="scope">
          <el-button
            size="mini"
            type="text"
            icon="el-icon-edit"
            @click="handleUpdate(scope.row)"
            v-hasPermi="['business:banner:edit']"
          >修改
          </el-button>
          <el-button
            size="mini"
            type="text"
            icon="el-icon-delete"
            @click="handleDelete(scope.row)"
            v-hasPermi="['business:banner:remove']"
          >删除
          </el-button>
        </template>
      </el-table-column>
    </el-table>

    <pagination
      v-show="total>0"
      :total="total"
      :page.sync="queryParams.pageNum"
      :limit.sync="queryParams.pageSize"
      @pagination="getList"
    />

    <!-- 添加或修改轮播图对话框 -->
    <el-dialog :title="title" :visible.sync="open" width="500px">
      <el-form ref="form" :model="form" :rules="rules" label-width="80px">
        <el-form-item label="轮播序号" prop="serialNo">
          <el-input type="number" v-model="form.serialNo" placeholder="请输入轮播序号"/>
        </el-form-item>
        <el-form-item label="轮播图" prop="imageUrl">
          <el-upload
            class="avatar-uploader"
            action
            :show-file-list="false"
            :before-upload="beforeAvatarUpload"
            :http-request="handleUploadForm"
            :accept="'.jpg,.png,.jpeg'"
          >
            <img class="banner-img" v-if="imageUrl" :src="imageUrl" />
            <el-button v-else type="primary">上传图片</el-button>
          </el-upload>
          <div>请上传长为350px,高150px的图片</div>
        </el-form-item>
        <el-form-item label="状态" prop="state">
          <el-select v-model="form.state" placeholder="请选择状态">
            <el-option v-for="item in stateOptions" :key="item.value" :label="item.label" :value="item.value"/>
          </el-select>
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button type="primary" @click="submitForm">确 定</el-button>
        <el-button @click="cancel">取 消</el-button>
      </div>
    </el-dialog>
  </div>
</template>

<script>
import { getToken } from '@/utils/auth';
import { addBanner, delBanner, getBanner, listBanner, updateBanner, uploadImage } from '@/api/business/banner'

const stateOptions = [
  {
    value: 1,
    label: '正常'
  },
  {
    value: 0,
    label: '禁用'
  }
]

export default {
  name: 'Banner',
  data() {
    return {
      // 遮罩层
      loading: true,
      // 选中数组
      ids: [],
      // 非单个禁用
      single: true,
      // 非多个禁用
      multiple: true,
      // 显示搜索条件
      showSearch: true,
      // 总条数
      total: 0,
      // 轮播图表格数据
      bannerList: [],
      // 弹出层标题
      title: '',
      // 是否显示弹出层
      open: false,
      // 查询参数
      queryParams: {
        pageNum: 1,
        pageSize: 10,
        serialNo: null,
        imageUrl: null,
        state: null
      },
      // 表单参数
      form: {},
      // 表单校验
      rules: {
        serialNo: [
          { required: true, message: '序号不能为空', trigger: 'blur' }
        ],
        imageUrl: [
          { required: true, message: '图片地址不能为空', trigger: 'blur' }
        ],
        state: [
          { required: true, message: '状态不能为空', trigger: 'blur' }
        ]
      },
      imageUrl: '',
      stateOptions: stateOptions,
      // myHeaders: { 'X-Token': getToken(),   'Content-Type': 'multipart/form-data' },
    }
  },
  created() {
    this.getList()
  },
  methods: {
    async handleUploadForm(param) {
      const formData = new FormData();
      let loading = this.$loading({
        lock: true,
        text: '上传中，请稍候...',
        spinner: 'el-icon-loading',
        background: 'rgba(0, 0, 0, 0.7)',
      });
      formData.append('file', param.file);
      try {
        const res = await uploadImage(formData, Math.floor(Math.random() * 10));
        this.imageUrl = res.data.url;
        this.form.imageUrl = res.data.url;
        loading.close();
      } catch (e) {
        loading.close();
      }
    },
    beforeAvatarUpload(file) {
      const isLt5M = file.size / 1024 / 1024 < 30;
      if (!isLt5M) {
        this.$message.error('上传头像图片大小不能超过 30MB!');
      }
      return isLt5M;
    },
    /** 查询轮播图列表 */
    getList() {
      this.loading = true
      listBanner(this.queryParams).then(response => {
        this.bannerList = response.rows
        this.total = response.total
        this.loading = false
      })
    },
    // 取消按钮
    cancel() {
      this.open = false
      this.reset()
    },
    // 表单重置
    reset() {
      this.form = {
        id: null,
        serialNo: null,
        imageUrl: null,
        state: null,
        createBy: null,
        createTime: null,
        updateBy: null,
        updateTime: null
      }
      this.resetForm('form')
    },
    /** 搜索按钮操作 */
    handleQuery() {
      this.queryParams.pageNum = 1
      this.getList()
    },
    /** 重置按钮操作 */
    resetQuery() {
      this.resetForm('queryForm')
      this.handleQuery()
    },
    // 多选框选中数据
    handleSelectionChange(selection) {
      this.ids = selection.map(item => item.id)
      this.single = selection.length !== 1
      this.multiple = !selection.length
    },
    /** 新增按钮操作 */
    handleAdd() {
      if (this.total > 8) {
        this.$message.error("最多只能新增8张轮播图");
        return;
      }
      this.reset()
      this.open = true
      this.title = '添加轮播图'
      this.imageUrl = '';
    },
    /** 修改按钮操作 */
    handleUpdate(row) {
      this.reset()
      const id = row.id || this.ids
      getBanner(id).then(response => {
        this.form = response.data
        this.imageUrl = response.data.imageUrl
        this.open = true
        this.title = '修改轮播图'
      })
    },
    /** 提交按钮 */
    submitForm() {
      this.$refs['form'].validate(valid => {
        if (valid) {
          if (this.form.id != null) {
            updateBanner(this.form).then(() => {
              this.$modal.msgSuccess('修改成功')
              this.open = false
              this.imageUrl = '';
              this.getList()
            })
          } else {
            addBanner(this.form).then(() => {
              this.$modal.msgSuccess('新增成功')
              this.open = false
              this.imageUrl = '';
              this.getList()
            })
          }
        }
      })
    },
    /** 删除按钮操作 */
    handleDelete(row) {
      const ids = row.id || this.ids
      this.$modal.confirm('是否确认删除轮播图？').then(function() {
        return delBanner(ids)
      }).then(() => {
        this.getList()
        this.$modal.msgSuccess('删除成功')
      }).catch(() => {
      })
    },
    /** 导出按钮操作 */
    handleExport() {
      this.download('business/banner/export', {
        ...this.queryParams
      }, `banner_${new Date().getTime()}.xlsx`)
    }
  }
}
</script>
<style lang="scss" scoped>
.banner-img {
  width: 200px;
}
</style>